LTC1699 LINER [Linear Technology], LTC1699 Datasheet - Page 10

• Manufacturer Part Number: LTC1699
• Description: SMBus VID Voltage Programmers
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LTC1699 Series
In general, adjustable DC/DC Converters regulate the
output voltage by dividing it down with a resistor divider
and comparing the result against a precision reference
voltage (V
LTC1699-80, LTC1699-81 and LTC1699-82 are variable
resistor dividers, which are programmed through a 2-wire
SMBus interface. They are specifically designed to sim-
10
REF
). As shown in the Block Diagram, the
U
Table 1. DC/DC Converter Output Voltage for V
U
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
W
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
U
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LTC1699-80
plify the implementation of a voltage regulator module
(VRM) in both portable and desktop computers.
Two 5-bit divider settings can be programmed into Regis-
ter 0 and Register 1 using the SMBus interface. The
microprocessor selects one of these settings using the
TTL compatible SEL pin to control a 10:5 multiplexer
(MUX). The precision 0.35% divider is intended to set the
2.000V
1.950V
1.900V
1.850V
1.800V
1.750V
1.700V
1.650V
1.600V
1.550V
1.500V
1.450V
1.400V
1.350V
1.300V
1.250V
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
1.050V
1.025V
1.000V
0.975V
0.950V
0.925V
0.900V
REF
= 0.8V
LTC1699-81
2.05V
2.00V
1.95V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
3.50V
3.40V
3.30V
3.20V
3.10V
3.00V
2.90V
2.80V
2.70V
2.60V
2.50V
2.40V
2.30V
2.20V
2.10V
2.00V
LTC1699-82
1.850V
1.825V
1.800V
1.775V
1.750V
1.725V
1.700V
1.675V
1.650V
1.625V
1.600V
1.575V
1.550V
1.525V
1.500V
1.475V
1.450V
1.425V
1.400V
1.375V
1.350V
1.325V
1.300V
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V